Improvement in friction-pulleys



UNITED STATES PATENT' OFFICE.

CHARLES BURLEIGH, oF' FrroHBUnG, MAssA-oHUsn'r'rs, AssIGNoR To THE ,PUTNAM MACHINE COMPANY, OF SAME PLoE.

i'MPRovEM ENT |`N Fnic'riolN- PULLEYs' Speciication forming part o f'Letters Patent No. 35,853, Vflflted July B, 1862.

To all whom it may'concern:

Be .it known that I; CHARLES BURLEIGH, of Fitchburg, in the county of W'orcester and State of Massachusetts, have invented an Impro'ved Friction-Pulley, of which the following is a full, clear, and exac't description, reference being had to'the accompanying draw ings, making part of this specification, in which-2 Figure 1 is'an end eievatio'n of the pnliey; Fig'. 2, a section through the same; Fig. 3, the friction-ring detached; Fig-i, a view of the clntch. o

The friction-pnlley which is the subject of my present invention is intended for driving lathes and other machinery; audit consists of a pnlley running loos'ely on ashaft and driven by ay belt from any suitable power, in combination with a ,friction-ring 'connected with the shaft, and'which the operator at will causes to cngage with the pulley and revolve the shaft..

r[hat others skilled in the art may understand and use my invention, I will proceed to describe the manner in which I have 'carried it out.

In the said drawings, Aisthe shai't on which the pullcy B rnns loosely, being driven by a belt from any suitabie power. A hub, C, to which are attached two arms, a a, is secnred by a pin, b, to the shaft A, and a ring,D,whieh' is cut open at c, is attached at one end by a screw, d, which passes through a slot, e, in the ring to the end of the arm 'a,. A slot, f, in the other end of the ring receives a screw, g,which falso screws into the end of the arin a. 'It does not Iconfine this end of the ring, but allows-the ring to be expanded in a manner' which will be pi'esently explained' A clamp, h, screwed .on the end of the arm a, confines the ring D inplacc, but does not prevent the ring from C moving between the clamp and arm when the -ring is expanded. A hub, E, (shown detached in Fig. 4,) slides'longitudinally on the shaft A, but is prevented from turning round on it by a pin. 3, which enters a slot, 4,in the shaft. It is moved on theshaft by a shippinglever, which clasps-it in a groove, l. A pin or clntch, k, with .an inclined face, 5, projects from'the end of this hub E, Its end enters a hole,.m, in'the arin'a', 'and its iuclined face 5 bears against a lever,-G, which is pivo'ted at 6 to the arm a, and vibrates it `when the hub E is inoved by the shipper toward the pulley.

As the lever G is vibrated-i-n the direction vof its arrow, its o'uter end,7, presses against the loose end 8 of the ring D, and expands it, (the ring, as stated,,being free to move all the way'round to' where it is sc-cnred at d,) when the outer face, 9,of the ring,coining into close contact with the innerface, 10, of the pulley, the friction of these surfaces carries 'the ring along with the' pulley, and thns drives the shai't A. Vhen the hub E ismoved away from the pulley and the clutch 7a is draw n hack to release the lever O, the spring of the ring D draws its ends together, and the pulley Bis again free to revolve without the ring. i

The above constitutes avvei'y neat and reliable friction-puliey,in which the large amount of surfuces (v,iz.,l the whole periphcry of the ring and the inner face, 10, of the pnlley) `which are brought into contact avoid the necessity of applying much force to hold the ring and pulle'y together, and -very little, exertion is necessary to 'unlock them, as the spring of the ring assists this movement, while it has the further advantage that but a small amount of niotion -of the hub E or clutch is necessary. What I claim as iny invention, and desire to secure by Letters Patent, is-

The loose pnliey B, in combination with the expanding-ring D, connected with the shaft A, and operated substantially iu the inanner specified.

' CHARLES BURLEIGI-I;

Witnessesz- Mosns FAIRBANKS, HALE W. PAGE. 

